string include method is 10x faster than creating

a new regex object every single time

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/action_dispatch/http/mime_type.rb

@@ -174,7 +174,7 @@ def parse(accept_header)
       # input: 'application'
       # returend value: [Mime::HTML, Mime::JS, Mime::XML, Mime::YAML, Mime::ATOM, Mime::JSON, Mime::RSS, Mime::URL_ENCODED_FORM
       def parse_data_with_trailing_star(input)
-        keys = Mime::LOOKUP.keys.select{|k| Regexp.new(input).match(k)}
+        keys = Mime::LOOKUP.keys.select{|k| k.include?(input)}
         Mime::LOOKUP.select {|k,_| keys.include?(k)}.collect{|i| i[1]}.inject([]){|all,e| all.include?(e) ? all : all << e}
       end
     end